Derivative Financial Instruments (Schedule of Other Comprehensive (Loss) Income Included In Derivative Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Derivative Financial Instruments
Deferred loss on the settlement of the treasury rate lock, net of tax	$ (3,827)	$ (4,625)	$ (3,354)
Deferred gain on the settlement of interest rate swap agreements entered into in connection with the Securitization, net of tax	0	202	497
Unrealized losses related to interest rate swap agreements, net of tax	$ (4,815)	$ 0	$ (2,083)